TABLE 2.
Serum group | No. of sera examined | No. (%) of positive sera
|
|||
---|---|---|---|---|---|
GRA7 | GRA1 | SAG1 | SAG1 + GRA7 + GRA1 | ||
Subgroup A (IgM and/or IgA ISAGA positive, low or borderline avidity) | 72 | 69 (95.9)b | 60 (83.3) | 71 (98.6) | 72 (100) |
Subgroup B (IgM and/or IgA ISAGA positive, high avidity) | 45 | 31 (68.9)b | 35 (77.8) | 45 (100) | 45 (100) |
Total (IgM and/or IgA ISAGA positive, low or high avidity) | 117 | 100 (85.5) | 95 (81.2) | 116 (99.1) | 117 (100) |
Negative control (IgG and IgM negative) | 19 | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
ISAGA, immunosorbent-agglutination assay.
χ2 = 16.1705, P < 0.001.